WP SmartPay - bKash Gateway

<?php

/**
 * WP SmartPay - bKash Gateway
 *
 * Plugin Name: WP SmartPay - bKash Gateway
 * Plugin URI:  https://wpsmartpay.com/
 * Description:
 * Tags: bKash
 * Version:     0.1
 * Author:      WPSmartPay
 * Author URI:  https://wpsmartpay.com/
 * Text Domain: wp-smartpay
 *
 * Requires PHP: 7.0.0
 * Requires at least: 4.9
 * Tested up to: 5.4
 */

// Exit if accessed directly.
if (!defined('ABSPATH')) {
    exit;
}

final class SmartPaybKashPaymentGateway
{
    /**
     * The single instance of this class
     */
    private static $instance = null;

    /**
     * Construct bKash class.
     *
     * @since 0.1
     * @access private
     */
    private function __construct()
    {
        add_action('init', [$this, 'process_webhooks']);
        add_filter('smartpay_payment_gateways', [$this, 'register_gateway']);
        add_action('smartpay_bkash_process_payment', [$this, 'process_payment']);
        add_filter('smartpay_settings_sections_gateways', [$this, 'gateway_section']);
        add_filter('smartpay_settings_gateways', [$this, 'gateway_settings']);
    }

    /**
     * Main bKash Instance.
     *
     * Ensures that only one instance of bKash exists in memory at any one
     * time. Also prevents needing to define globals all over the place.
     *
     * @since 0.1
     * @return object|bKash
     * @access public
     */
    public static function instance()
    {
        if (!isset(self::$instance) && !(self::$instance instanceof bKash)) {
            self::$instance = new self();
        }

        return self::$instance;
    }

    public function register_gateway($gateways)
    {
        $gateways['bkash'] = array(
            'admin_label'       => 'bKash',
            'checkout_label'    => 'bKash'
        );

        return $gateways;
    }

    /**
     * Process webhook requests.
     *
     * @since 1.1.0
     * @return void
     * @access public
     */
    public function process_webhooks()
    {
        if (isset($_GET['smartpay-listener']) && $_GET['smartpay-listener'] == 'bkash') {
            echo 'bKash webhook';
            die();
        }
    }

    public function process_payment($payment_data)
    {
        // $payment_data

        $payment_id = smartpay_insert_payment($payment_data);

        if ($payment_id) {
            $redirect_uri = smartpay_get_success_page_uri();
            wp_redirect($redirect_uri);
        } else {
            die('Error');
        }
    }

    /**
     * Add Gateway subsection
     *
     * @since 1.0.0
     * @param array $sections Gateway subsections
     * @return array
     * @access public
     */
    public function gateway_section(array $sections = array()): array
    {
        $sections['bkash'] = __('bKash', 'wp-smartpay');

        return $sections;
    }


    /**
     * Register the gateway settings for bKash
     *
     * @since 1.1.0
     * @param array $settings
     * @return array
     * @access public
     */
    public function gateway_settings(array $settings): array
    {

        $gateway_settings = array(
            array(
                'id'    => 'bKash_settings',
                'name'  => '<strong>' . __('bKash Gateway Settings', 'wp-smartpay') . '</strong>',
                'desc'  => __('Configure your bKash Gateway Settings', 'wp-smartpay'),
                'type'  => 'header'
            ),

            array(
                'id'    => 'bkash_vendor_id',
                'name'  => __('Vendor ID', 'wp-smartpay'),
                'desc'  => __('Enter your bKash Vendor ID', 'wp-smartpay'),
                'type'  => 'text'
            ),
            array(
                'id'    => 'bkash_vendor_auth_code',
                'name'  => __('Auth Codes', 'wp-smartpay'),
                'desc'  => __('Get Auth Code from bKash : Developer > Authentication', 'wp-smartpay'),
                'type'  => 'text'
            ),

            $bKash_webhook_description_text = __(
                sprintf(
                    '<p>For bKash to function completely, you must configure your Instant Notification System. Visit your <a href="%s" target="_blank">account dashboard</a> to configure them. Please add the URL below to all notification types. It doesn\'t work for localhost or local IP.</p><p><b>INS URL:</b> <code>%s</code></p>.',
                    'https://vendors.bKash.com/alerts-webhooks',
                    home_url("index.php?smartpay-listener=bKash")
                ),
                'wp-smartpay'
            ),

            $_SERVER['REMOTE_ADDR'] == '127.0.0.1' ? $bKash_webhook_description_text .= __('<p><b>Warning!</b> It seems you are on the localhost.</p>', 'wp-smartpay') : '',

            array(
                'id'    => 'bKash_webhook_description',
                'type'  => 'descriptive_text',
                'name'  => __('Instant Notification System (INS)', 'wp-smartpay'),
                'desc'  => $bKash_webhook_description_text,

            ),
        );

        return array_merge($settings, ['bkash' => $gateway_settings]);
    }
}

return SmartPaybKashPaymentGateway::instance();